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# FP3 Further Coordinate Systems watch

1. Seriously stuck.

The point P lies on the ellipse with equation 9x^2 + 25y^2 = 225. A(-4,0) B(4,0).
a) Prove that PA+PB =10
b) Prove also that the normal at P bisects the angle APB.

Thanks
2. (Original post by MrJai24)
Seriously stuck.

The point P lies on the ellipse with equation 9x^2 + 25y^2 = 225. A(-4,0) B(4,0).
a) Prove that PA+PB =10
b) Prove also that the normal at P bisects the angle APB.

Thanks
http://www.thestudentroom.co.uk/forumdisplay.php?f=38

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